What this means
The IEEE assigned the MA-M block 383A21B to Pactron. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 38:3A:21:B, it is Pactron hardware.
Frequently Asked Questions
Who owns MAC prefix 383A21B?
383A21B is registered to Pactron in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. Pactron's block covers 1,048,576 addresses.
What devices use 383A21B?
Any network device with a MAC address starting 38:3A:21:B was manufactured by or for Pactron.